Acquire and Analyze Sound Pressure Data from an IEPE Microphone

This example shows how to acquire and display sound pressure data from a PCB® IEPE array microphone, Model 130E20. The sensor is recording sound pressure generated by a tuning fork at Middle C (261.626 Hz) frequency.

Discover Devices that Support Microphones

To discover a device that supports Microphones, click the name of the device in the list in the Command window, or access the device in the array returned by daq.getDevices command. For this example, the microphone is connected on channel 0 of National Instruments® device 9234 on CompactDAQ Chassis NI cDAQ-9174 with ID cDAQ1Mod3.

Create Session and Add Microphone Channel

Set Sensor Properties

Set the microphone's Sensitivity to the value specified in the sensor's data sheet. For this sensor, the Sensitivity value is 0.037 Volts/Pascal. Examine the channel properties to see changes device configuration.